A nurse is teaching a class about oral hygiene. The nurse should include that which of the following substances coats the teeth to protect them from plaque?
Enamel.
Langerhans cells.
Cilia.
Keratin.
The Correct Answer is A
Choice A rationale
Enamel is the hardest and most highly mineralized substance in the human body, covering the outer layer of each tooth. It acts as a protective barrier against the acids produced by plaque bacteria and mechanical wear from chewing. Because it lacks living cells, it cannot repair itself once damaged. Maintaining this mineralized shield is critical in preventing dental caries and preserving the structural integrity of the teeth.
Choice B rationale
Langerhans cells are dendritic cells found primarily in the stratum spinosum of the epidermis and are part of the immune system. They function as antigen-presenting cells, identifying foreign invaders and initiating an immune response. They have no role in the structural coating of teeth or protection against plaque. Their presence is vital for skin immunity and capturing pathogens that breach the physical skin barrier.
Choice C rationale
Cilia are microscopic, hair-like projections found on the surfaces of certain cells, such as those lining the respiratory tract. They function to move mucus and trapped particles out of the lungs through a rhythmic waving motion. Cilia are biological structures involved in clearance and transport within mucous membranes. They are not found in dental anatomy and do not provide a protective coating for the teeth.
Choice D rationale
Keratin is a fibrous structural protein that makes up the outer layer of the skin, hair, and nails, providing a waterproof and protective surface. While it is essential for the integrity of the integumentary system, it is not a component of dental tissue. Keratinization helps the skin withstand friction and environmental exposure, but the teeth rely on mineralized enamel rather than protein-based keratin for protection.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Choice A rationale
Pulse intensity is documented on a scale where 4+ represents a bounding pulse that is exceptionally strong and difficult to obliterate. Since the nurse noted the right radial pulse was bounding, 4+ is the correct numerical value. The normal heart rate for an adult is 60 to 100 beats per minute, making 80 per minute an expected finding. This documentation accurately reflects the palpable strength and rhythmic frequency observed during the physical assessment.
Choice B rationale
A 1+ pulse grade indicates a weak, thready, or diminished pulse that is easily obliterated by light pressure. The prompt states the left radial pulse was as expected, which corresponds to a normal strength rather than a weak one. Documenting a 1+ would provide an inaccurate clinical picture suggesting poor perfusion or low stroke volume in the left extremity, which contradicts the assessment findings described for this specific client scenario.
Choice C rationale
A 2+ pulse grade signifies a normal, expected pulse strength that is easily palpated but not bounding. While the heart rate of 80 is correct, the 2+ grade does not match the description of the right radial pulse being bounding. Bounding pulses often occur in states of high cardiac output or fluid volume excess. Using 2+ for the right side would underreport the intensity and potentially miss a significant clinical indicator of hemodynamic status.
Choice D rationale
Documenting the left radial pulse as 4+ is incorrect because the assessment found the left pulse to be as expected. An expected or normal pulse is typically graded as 2+ or 3+ depending on the specific facility scale, but never 4+. A 4+ designation is reserved for pulses that feel unusually strong and full. Mislabeling a normal pulse as bounding could lead to unnecessary concern regarding the client's cardiovascular status or fluid balance.
Correct Answer is D
Explanation
Choice A rationale
This stage occurs after the initial entry of the pathogen into the host but before the appearance of any clinical symptoms. During this phase, the infectious agent is actively replicating within the body without causing detectable functional changes or systemic responses. Because the client is currently exhibiting overt clinical symptoms such as fever, productive cough, and muscle aches, they have already progressed far beyond this initial, asymptomatic silent phase of the infectious process.
Choice B rationale
This period represents the transition from the end of incubation to the onset of full blown clinical disease. It is characterized by the appearance of vague, non specific symptoms like malaise or low grade fever. While the client has muscle aches and headaches, the presence of a productive cough and a fever that has progressed over four days suggests they have moved into a more specific and severe stage of the systemic inflammatory response.
Choice C rationale
This phase marks the recovery period when the clinical manifestations of the infection begin to disappear and the body repairs damaged tissues. The immune system has successfully contained the pathogen, and the host begins to return to a state of health. Since the client reports that their symptoms have been progressing and are currently active with a productive cough and fever, they are not yet in the recovery or resolution phase of the illness.
Choice D rationale
This stage is characterized by the peak of clinical manifestations where the infection is most severe and symptoms are highly specific to the affected system. The presence of a productive cough indicates lower respiratory involvement, while the fever and muscle aches signify a systemic response. Having these symptoms for four days with clear progression aligns perfectly with the maximal infectious burden and inflammatory activity seen during the acute period of a viral or bacterial infection.
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